Both need to be addressed now. Question 1 dictates the action. She needs to go now, pull Veja aside and talk this out before it builds any more steam. Archon and explosive decompression don't go well together, so this pressure needs a safety valve.

Panel 4 should have given her the other answer. Innocent lives are at stake here. It is an unwritten rule of war that innocent people will die. The corollary to that rule is that the non-innocent need to have priority on the to-die list. There is a time and place for diplomacy: before the shooting starts; or, after one side forces the other to realize continued shooting is not in it's best interest. In between is not diplomacy, it's dissuasion. Normally, forceful dissuasion.

Arua is a peacemaker at heart, she's never seen the brutality of war before. She needs to learn quickly that war is ugly. They're not going to be able to make peace with the leader of Ailmer. They're going to have to defeat them.